Managing Mission - Critical Domains and DNS

The proper way to do sub-/24 PTR records

"The only sane way to delegate sub-/24 PTR authority is to delegate per /32.

Assuming the parent holds authority over 192.0.2.0/24, they have this zone:

2.0.192.in-addr.arpa. IN SOA .... IN NS ..

Now, suppose we want to delegate 192.0.2.0/25 to our example.com customer, we do:

0.2.0.192.in-addr.arpa. IN NS ns.example.com. 1.2.0.192.in- addr.arpa. IN NS ns.example.com. 2.2.0.192.in-addr.arpa. IN NS ns.example.com. ... 127.2.0.192.in-addr.arpa. IN NS ns.example.com.

Our customer, example.com, then creates 128 zones (yes, really) to receive these 128 delegations. Yes, it looks cumbersome, but if you run mission critical stuff, you have a management panel or decent automation. If you don't have a panel, ...